[Bug c++/60459] New: Crash seen in _Unwind_VRS_Pop() for ARM platform

[raghupv30 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60459

Bug ID: 60459
   Summary: Crash seen in _Unwind_VRS_Pop() for ARM platform
   Product: gcc
   Version: 4.2.1
Status: UNCONFIRMED
  Severity: blocker
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: raghupv30 at gmail dot com

Hi,

With ARM target platform, crashes in _Unwind_VRS_Pop() during exception
propagation.
Below is the stack trace:

Program terminated with signal 11, Segmentation fault.
#0 _Unwind_VRS_Pop (context=0x1140bf4, regclass=,
discriminator=, representation=_UVRSD_UINT32) at
/home/ben/Katalix/Toolchain/drx780-build/stb_toolchain_2.1/toolchain_build_arm_nofpu/gcc-4.2.1/gcc/config/arm/unwind-arm.c:269
#0 _Unwind_VRS_Pop (context=0x1140bf4, regclass=,
discriminator=, representation=_UVRSD_UINT32) at
/home/ben/Katalix/Toolchain/drx780-build/stb_toolchain_2.1/toolchain_build_arm_nofpu/gcc-4.2.1/gcc/config/arm/unwind-arm.c:269
ptr = 0x4
mask = 16384
i = 14
#1 0x1a5ac6f8 in __gnu_unwind_execute (context=0x1140bc0, uws=0x1140b80) at
/home/ben/Katalix/Toolchain/drx780-build/stb_toolchain_2.1/toolchain_build_arm_nofpu/gcc-4.2.1/gcc/config/arm/pr-support.c:157
op = 16384
set_pc = 0
reg = 1
#2 0x1a5abdf0 in __gnu_unwind_pr_common (state=_US_UNWIND_FRAME_STARTING,
ucbp=0x11416f8, context=0x1140bc0, id=1) at
/home/ben/Katalix/Toolchain/drx780-build/stb_toolchain_2.1/toolchain_build_arm_nofpu/gcc-4.2.1/gcc/config/arm/unwind-arm.c:974
uws =
{data = 0, next = 0xb14aa8, bytes_left = 0 '\000', words_left = 0 '\000'}

data = 
offset = 8
len = 18091248
rtti_count = 18091248
phase2_call_unexpected_after_unwind = 9
in_range = 
forced_unwind = 18093816
#3 0x1b09d6dc in ?? ()
No symbol table info available.
#4 0x1b09d6dc in ?? ()
No symbol table info available.


Analysing the core dump:


(gdb) x/24i _Unwind_VRS_Pop
   0x1a5ac34c <_Unwind_VRS_Pop>:push{r4, r5, r6, r7, r8, r10, lr}
   0x1a5ac350 <_Unwind_VRS_Pop+4>:  mov r7, r0
   0x1a5ac354 <_Unwind_VRS_Pop+8>:  sub sp, sp, #140; 0x8c
   0x1a5ac358 <_Unwind_VRS_Pop+12>: mov r5, r3
   0x1a5ac35c <_Unwind_VRS_Pop+16>: cmp r1, #4
   0x1a5ac360 <_Unwind_VRS_Pop+20>: addls   pc, pc, r1, lsl #2
   0x1a5ac364 <_Unwind_VRS_Pop+24>: b   0x1a5ac468
<_Unwind_VRS_Pop+284>
   0x1a5ac368 <_Unwind_VRS_Pop+28>: b   0x1a5ac384 <_Unwind_VRS_Pop+56>
   0x1a5ac36c <_Unwind_VRS_Pop+32>: b   0x1a5ac3cc
<_Unwind_VRS_Pop+128>
   0x1a5ac370 <_Unwind_VRS_Pop+36>: b   0x1a5ac37c <_Unwind_VRS_Pop+48>
   0x1a5ac374 <_Unwind_VRS_Pop+40>: b   0x1a5ac37c <_Unwind_VRS_Pop+48>
   0x1a5ac378 <_Unwind_VRS_Pop+44>: b   0x1a5ac37c <_Unwind_VRS_Pop+48>
   0x1a5ac37c <_Unwind_VRS_Pop+48>: mov r0, #1
   0x1a5ac380 <_Unwind_VRS_Pop+52>: b   0x1a5ac46c
<_Unwind_VRS_Pop+288>
   0x1a5ac384 <_Unwind_VRS_Pop+56>: cmp r3, #0
   0x1a5ac388 <_Unwind_VRS_Pop+60>: bne 0x1a5ac468
<_Unwind_VRS_Pop+284>
   0x1a5ac38c <_Unwind_VRS_Pop+64>: lsl r2, r2, #16
   0x1a5ac390 <_Unwind_VRS_Pop+68>: ldr r12, [r0, #56]  ; 0x38
   0x1a5ac394 <_Unwind_VRS_Pop+72>: lsr r2, r2, #16
   0x1a5ac398 <_Unwind_VRS_Pop+76>: mov r1, r3
   0x1a5ac39c <_Unwind_VRS_Pop+80>: mov lr, #1
   0x1a5ac3a0 <_Unwind_VRS_Pop+84>: andsr3, r2, lr, lsl r1
=> 0x1a5ac3a4 <_Unwind_VRS_Pop+88>: ldrne   r3, [r12], #4
   0x1a5ac3a8 <_Unwind_VRS_Pop+92>: add r0, r7, r1, lsl #2

(gdb) info locals
ptr = 0xfa
mask = 26624 = 0x6800
i = 11

print ptr
$1 = (_uw *) 0xfa
(gdb) print *ptr
Cannot access memory at address 0xfa
(gdb) info reg
r0 0x11a6be818508776
r1 0xb  11
r2 0x6800   26624
r3 0x8002048
r4 0x86800  550912
r5 0x0  0
r6 0x11a6bc018508736
r7 0x11a6bc018508736
r8 0x0  0
r9 0xff04080
r100x11a6b4418508612
r110x1a5b5f2c   442195756
r120xfa 250
sp 0x11a6a900x11a6a90
lr 0x1  1
pc 0x1a5ac3a4   0x1a5ac3a4 <_Unwind_VRS_Pop+88>
cpsr   0x10 16


Using the gcc in http://ftp.gnu.org/gnu/gcc/gcc-4.2.1/gcc-core-4.2.1.tar.bz2

Is anyone aware of the reason for this crash in _Unwind_VRS_Pop() for ARM
platform?


Thanks in advance

-Raghu

[Bug target/60459] Crash seen in _Unwind_VRS_Pop() for ARM platform

[raghupv30 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60459

--- Comment #3 from Raghu  ---
(In reply to Andrew Pinski from comment #1)
> Can you try a newer version than GCC 4.2.1?
> 
> Also can you provide the exact options you compiled your source with?  And
> the exact configure options you configured GCC with?

Hi,

I am using the GCC which we got from the toolchain for ARM target.
Below are config options with which GCC was configured.

./gcc -B./ -v
Using built-in specs.
Target: arm-linux-uclibcgnueabi
Configured with:
/home/ben/Katalix/toolchain/arm-toolchain/stb_toolchain_2.1/toolchain_build_arm_nofpu/gcc-4.2.1/configure
--prefix=/usr --build=i386-pc-linux-gnu --host=i386-pc-linux-gnu
--target=arm-linux-uclibcgnueabi --enable-languages=c,c++
--with-sysroot=/opt/toolchains/tools-4.2.1-arm9
--with-build-time-tools=/opt/toolchains/tools-4.2.1-arm9/usr/arm-linux-uclibcgnueabi/bin
--disable-__cxa_atexit --enable-target-optspace --with-gnu-ld --enable-shared
--with-gmp=/home/ben/Katalix/toolchain/arm-toolchain/stb_toolchain_2.1/toolchain_build_arm_nofpu/gmp
--with-mpfr=/home/ben/Katalix/toolchain/arm-toolchain/stb_toolchain_2.1/toolchain_build_arm_nofpu/mpfr
--disable-nls --enable-threads --enable-multilib --with-float=soft
--with-tune=arm920t
Thread model: posix
gcc version 4.2.1


Please advice if the above configure options are correct?

Any thoughts why the crash in _Unwind_VRS_Pop() is seen?

We don't have another version of ARM toolchain. Is there any stable prebuild
toolchain for ARM platform to use?

Thanks,
Raghu

[Bug target/60459] Crash seen in _Unwind_VRS_Pop() for ARM platform

[raghupv30 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60459

Raghu  changed:

   What|Removed |Added

   Severity|normal  |critical